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Microbiological Sampling of Carcasses by Excision or Swabbing with Three Types of Sponge or Gauze

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Fifty-five bovine, 50 equine, 60 ovine, and 50 porcine carcasses were sampled in a slaughterhouse in eastern Spain. Two samples were taken from each carcass, one using the excision method and the other using the swabbing method. Four different materials were used for swabbing: cellulose, polyurethane, or viscose sponges, and medical gauze. Samples were collected at the end of the process by four different people before the carcasses were taken to the cooler. The samples were examined for total viable bacteria counts (TVCs) and Enterobacteriaceae counts (ECs). The mean TVC for all species sampled by excision was 4.50 log CFU/cm2, which was significantly higher than the 3.53 log CFU/cm2 obtained by swabbing. The TVCs obtained using gauze and the cellulose and polyurethane sponges were significantly higher (P < 0.05) than the corresponding TVCs obtained using viscose sponges. Animal species, the person who collected the samples, and microbiological load also had a significant effect on TVC. ECs were obtained from 82.8% of excision samples, from larger percentages of samples obtained using cellulose or polyurethane sponges or gauze swabs, but from smaller percentages of samples obtained using viscose sponges. The Enterobacteriaceae load significantly influenced the EC. In contrast, animal species and the person who collected the samples had no significant effect. The cellulose sponge, polyurethane sponge, and gauze gave high mean log counts of aerobic bacteria and Enterobacteriaceae, which makes these swab types suitable for use in slaughterhouses for the purpose of assessing production process hygiene.

Document Type: Research Article

Affiliations: 1: Centre of Public Health of Alzira, Conselleria de Sanidad, C/ Pau, s/n, E-46600, Alzira, Valencia, Spain 2: INCA Laboratory, C/Federico Pallardó, 5 bajo, E-46910, Alfafar, Valencia, Spain 3: Animal Production and Food Science and Technology Department, Cardenal Herrera–CEU University, Edificio Seminario sn. E-46113, Moncada, Valencia, Spain

Publication date: January 1, 2010

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